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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 379 (Engine Controls Self-Diagnostics - 3.4L) >> Diagnostic Tests >> DTC P0030: Ho2S 1 Heater Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Start engine. Allow the engine to idle at operating temperature. Monitor the HO2S 1 HEATER CURRENT parameter using a scan tool. Allow the current to stabilize. Is the HO2S 1 Heater Current 0.25-0.85 amp? If yes, go to next step. If no, go to step  4.
  3. Observe the Freeze Frame/Failure Records data for this DTC. Turn ignition off for 30 seconds. Start the engine. Operate the vehicle within the Conditions For Running or as close to the Freeze Frame/Failure Records data that you observed. See CONDITIONS FOR RUNNING . Does the DTC fail this ignition? If yes, go to next step. If no, go to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 3.4L ALERO, GRAND AM, IMPALA & MONTE CARLO article.
  4. Turn ignition switch to OFF position. Disconnect the HO2S 1 harness connector. Start the engine. Allow the engine to idle at operating temperature. Observe the DTC Info parameter using the scan tool for at least 30 seconds. Does the DTC fail this ignition? If yes, go to next step. If no, go to step  6.
  5. Check the HO2S 1 heater low control circuit for a short to voltage. If yes, go to step  10. If no, go to step  7.
  6. Check for intermittent or poor connections at the HO2S 1 harness connector. Did you find and correct the condition? If yes, go to step  10. If no, go to step  8.
  7. Check for poor connections at the harness connector of the PCM. Did you find and correct the condition? If yes, go to step  10. If no, go to step  9.
  8. Replace the HO2S 1. After replacing sensor, go to step  10.
  9. Turn ignition switch to OFF position. Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, go to next step.
  10. Clear the DTCs using a scan tool. Turn switch to OFF position for 30 seconds. Start the engine. Operate the vehicle within the Conditions For Running. See CONDITIONS FOR RUNNING . Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  11. Using the scan tool, observe the stored information in CAPTURE INFO. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay at this time.
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